Daniel Merriman joined VG Instruments, now Thermo Fisher Scientific in 1988, he has held many roles associated with online process analytics and particularly mass spectrometry, he is currently a strategic marketing manager at Thermo Fisher. During his career he has worked extensively to advance the use of online mass spectrometry as a Process Analytical Technology (PAT) in the biotechnology sector, working with industry and academia to develop applications for monitoring fermentation and cell culture processes. Daniel has recently co-authored papers with University College London and the National Institute for Bioprocess Research & Training (NIBRT) on the subject of mammalian cell culture monitoring by online mass spectrometry.